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Chapter 9
Central Processing Unit board (PN-C01410)
The Central Processing Unit (CPU) Board is a six (6) inch by six (6) inch circuit board that
contains the main processor and program memory. It has total control over the Servo
Tyer and can communicate with a dumb terminal using the serial port connector on the
front edge of the board. The CPU Board is attached to the Auxiliary Board with four (4)
mounting screws. Signal connections between these two boards are made through the
eighty (80) pin connector J2. The CPU Board has a seven-segment LED display that can
display machine status one (1) character at a time (see pg. 112). The CPU board is
considered a replacement unit. The proprietary software used to control the Servo Tyer
was developed by Burford
®
and cannot be altered in the field.
Auxiliary board (PN-C01267)
The Auxiliary (Aux) Board is a six (6) inch by eleven (11) inch circuit board that is
controlled by the CPU Board through the eighty (80) pin connector J3. The Aux Board
contains the decoder electronics for the motor encoders as well as the pre-drivers and
motor drivers for each of the four (4) axis. This board converts sensor and encoder signals
to five (5) volt logic and relays them to the CPU board. Connections to motor power and
the motors are made at the edge of this board. Each motor output is fused individually to
protect the board from a shorted output. The rest of the connections are made through
the ninety-six (96) pin connector J2 to the Field Termination Board. The Aux board also
contains two (2) relays, which are described on pg.172
Field Termination Board (PN-C01299)
The Field Termination Board (FTB) is a six (6) inch by eight (8) inch circuit board that is
a point of mass termination for the Main Enclosure. With the exception of the motors, all
Servo Tyer signals are routed through the FTB to the Auxiliary board using the ninety-six
(96) pin connector J1. The FTB contains five (5) control relays. In addition, there are
thirty-four (34) status LED's that can be used for troubleshooting.
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